to the leaked AMD slides, it appears that the upcoming Radeon HD 7970 is between 30 and 60 percent faster than the GTX 580 at 2560x1600 and at various levels of AA and AF.
Of course, as we are talking about AMD slides these results are probably the best case scenarios that Radeon HD 7970 can offer, but these are well in line with those performance figures that we have heard from our sources. The best, or 60 percent gain, is in titles like BattleForge, Shogun 2 and Civilization 5, while the worse 30 and 35 percent gain is in AVP (@1920x1200 1xMSAA) and at Crysis 2 at 2560x1600 resolution. You can check out other titles from the graph below.
Unfortunately, 2560x1600 resolution isn't the one that most users use as 1920x1080, or 1920x1200 one is more common these days. Of course, we'll have to wait for some official third party reviews rather than make any conclusions based on in-house performance tests to see the actual performance of the HD 7970, and those are just two days away. So far, things are looking pretty good for AMD.